Well I think our t's interpret everything we do, given them, or whatever as having some meaning. Even if we don't want them to. It was an honest mistake as you didn't really think about the content before you sent it. I'd just be honest with him and say oops, I just wanted to let you know I didn't give it much forethought before I sent that to you and hope you didn't find it offensive but I thought it was funny and so I thought I'd share it. Sorry if it was offensive in anyway. Then don't worry about it.